--- title: "What is horizontal work? · DeliverySheet" description: "Horizontal work is a cross-cutting concern that pulses into several delivery streams at gates: security, legal, compliance, design, accessibility, privacy." canonical_url: "https://www.deliverysheet.com/glossary/horizontal-work" meta: author: "Tan Gravam" "og:description": "Horizontal work is a cross-cutting concern that pulses into several delivery streams at gates: security, legal, compliance, design, accessibility, privacy." "og:image": "https://www.deliverysheet.com/_og/s/o_b2b1e55c8550ec29.png" "og:image:alt": "Horizontal work — DeliverySheet glossary card" "og:image:height": "600" "og:image:type": image/png "og:image:width": "1200" "og:title": "What is horizontal work? — DeliverySheet glossary" "twitter:description": "Horizontal work is a cross-cutting concern that pulses into several delivery streams at gates: security, legal, compliance, design, accessibility, privacy." "twitter:image": "https://www.deliverysheet.com/_og/s/o_b2b1e55c8550ec29.png" "twitter:image:alt": "Horizontal work — DeliverySheet glossary card" "twitter:title": "What is horizontal work? — DeliverySheet glossary" --- > Index of every page on this site: [llms.txt](https://www.deliverysheet.com/llms.txt) [← All terms](https://www.deliverysheet.com/glossary) **Glossary ** # **What is horizontal work?** Horizontal work is a cross-cutting concern that pulses into several delivery streams at specific gates — security review, legal, compliance, design, accessibility, privacy. A horizontal is rarely a standalone deliverable; its function is to gate other teams’ progress. Its load is driven by other people’s schedules, which is why several streams reaching the same gate in the same fortnight is the most predictable "surprise" bottleneck in delivery. ## **Why horizontal work is the most predictable surprise in delivery** Its load is not driven by its own schedule but by everyone else's. Three streams that were planned independently all reach their security gate in the same fortnight, and the reviewer who was allocated a comfortable ten per cent across the quarter is now the constraint on three commitments at once. Nothing went wrong in any individual plan; the collision was created by planning them separately. Averaging hides it. A horizontal sized as a quarterly percentage looks harmless on every plan it appears in, and the peak — the only number that matters — appears on none of them. ## **How to plan horizontal work** Size it by gate, not by rate: which streams need this concern, at what point in each, and what the review actually costs when it happens. Then look across the streams for the fortnights where two or three gates land together, because that is where the delay will come from. Treat a horizontal as a dependency with an owner rather than a task inside someone else's stream. It has its own capacity, its own queue and its own ability to say not yet — and a plan that does not name who owns it has quietly assumed the answer will always be yes. [The essay behind “Horizontal work” →](https://www.deliverysheet.com/blog/vertical-and-horizontal-work) [Topic: Planning that stays honest →](https://www.deliverysheet.com/topics/planning) ## **Related terms ** - [Readiness (three-state)](https://www.deliverysheet.com/glossary/readiness-three-state) Three-state readiness means a planning dimension has three states, not two: not assessed, assessed and nothing found, and assessed with items. - [Time-boxed discovery](https://www.deliverysheet.com/glossary/time-boxed-discovery) A time-boxed discovery is a deliberate learning step taken instead of a decision: a goal, optionally the questions to answer, a time-box, and a target date on which it must conclude with recorded findings and an explicit decision. - [RAID log](https://www.deliverysheet.com/glossary/raid-log) A RAID log is a register of the four places delivery surprises come from — risks, assumptions, issues and dependencies — kept so each has demonstrably been looked at, not merely listed. This definition comes from building **DeliverySheet** — it takes a vague work request to a clear delivery decision, so the shape, owner, capacity, dependencies and open questions are on the table before anyone commits people or a date. $189/month per workspace, unlimited members. 7-day free trial — card required, cancel before it ends and you're not charged. I answer the support email myself. [**Start 7-day trial **](https://www.deliverysheet.com/login?next=/app) [**All terms **](https://www.deliverysheet.com/glossary) [**See pricing **](https://www.deliverysheet.com/pricing) ```json {"@context":"https://schema.org","@type":"DefinedTerm","@id":"https://www.deliverysheet.com/glossary/horizontal-work#term","name":"Horizontal work","description":"Horizontal work is a cross-cutting concern that pulses into several delivery streams at specific gates — security review, legal, compliance, design, accessibility, privacy.","url":"https://www.deliverysheet.com/glossary/horizontal-work","inDefinedTermSet":"https://www.deliverysheet.com/glossary#termset"} ``` ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.deliverysheet.com/#website","@type":"WebSite","description":"Turn raw work requests into structured, decision-ready demands before you commit people, budget, or a date. 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